Calibrating the depth measurement
In order to provide correct and accurate readings, the depth measurement must be calibrated. The purpose of the Calibration dialog box is to accept and apply the calibration information from the depth sensor calibration.
Prerequisites
To perform the calibration of the depth measurement, you need a suitable rope.
Context
The sensor detects the depth using water pressure measurements. Calibration is made automatically by readjusting this measurement against a known depth. In order to calibrate the depth measurement, it must be submerged into salt water. The software provided for calibration assumes that the sensor is lowered to your desired “0” (starting) point + 1m.
You can currently calibrate the depth measurement for sensors interfacing PI50 or PI60 Receiver Units.
Procedure
1 Mount a rope to the top fastening lugs on the sensor.
2 Tighten the rope, and measure one meter from the lid of the sensor to a spot on the rope.
Place a visual marker on the rope at that location.
3 Lower the sensor over the side of the vessel and into the water until the visual marker on the rope is even with the surface.
If you wish to use a depth reference different than the sea surface, change the marking on the rope to fit your preference. You can also attach the sensor one meter under a floating device. You must test this arrangement before you use it. Make sure that the sensor lid (with the pressure detection device) is placed at one meter depth when the unit is lowered into the water.
4 Observe the numerical presentation of the sensor depth, and allow the reading to stabilize itself.
5 On the Setup menu, select Calibration.
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6 Select the input system from the available list.
7 Select Start Calibration.
8 Wait for the system to do the calibration.
The dialog box will close when the calibration process is finished.
9 Observe the numerical presentation of the sensor depth, and verify that it reads 1 meter.
10 Select Close to save the chosen settings and close the dialog box.
11 Retrieve the sensor from the water.